[Java] TestMysqlConnection ( Java 连接 mysql 初步)

最新推荐文章于 2022-05-10 08:47:23 发布

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最新推荐文章于 2022-05-10 08:47:23 发布

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分类专栏： Java / Spring / Guava

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本文介绍了使用Java连接MySQL数据库并执行SQL查询的基本步骤，包括加载驱动、建立连接、创建语句、执行查询以及处理结果。

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import java.sql.*;

public class TestMysqlConnection {

    public static void main(String[] args) {
        Connection conn = null;
        Statement stmt = null;
        ResultSet rs = null;
        try {
            Class.forName("com.mysql.jdbc.Driver");
            System.out.println("HERE");
            conn = DriverManager.getConnection("jdbc:mysql://localhost/mydata?user=root&password=root");
            System.out.println("HERE");
            stmt = conn.createStatement();
            rs = stmt.executeQuery("select * from dept");
            while (rs.next()) {
                System.out.println(rs.getString("deptno"));
            }

        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException ex) {
            // handle any errors
            System.out.println("SQLException: " + ex.getMessage());
            System.out.println("SQLState: " + ex.getSQLState());
            System.out.println("VendorError: " + ex.getErrorCode());
        } finally {
            try {
                if (rs != null) {
                    rs.close();
                    rs = null;
                }
                if (stmt != null) {
                    stmt.close();
                    stmt = null;
                }
                if (conn != null) {
                    conn.close();
                    conn = null;
                }
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }

    }

}